Windows only: Have you ever told a little white lie about when you started working on a project, hoping nobody would notice that the file timestamps disagree? SKTimeStamp helps you lie more effectively.

Once you've installed the explorer add-on, all you have to do is right-click on a file, choose the TimeStamps tab, change the dates to anything you want, and then click the Touch button. The file will magically appear to have been created or modified whenever you specified—though depending on the type of file some of the other metadata might rat you out. It's no substitute for telling the truth, but it's a great little tool just in case you ever need it.